Angiogenic Switching in the Alveolar Capillaries in Primary Lung Adenocarcinoma and Squamous Cell Carcinoma
スポンサーリンク
概要
- 論文の詳細を見る
The status of angiogenic switching was examined in alveolar capillaries of primary lung adenocarcinoma (ADC) from 10 patients and primary squamous cell carcinoma (SCC) from 11 patients, using immunostaining for CD31, thrombomodulin, von Willebrand factor (vWF), collagen types IV and VII, and α-smooth muscle actin (α-SMA). We applied the TdT-mediated dUTP nick-end labeling assay and the reverse transcription-polymerase chain reaction for vascular endothelial growth factor (VEGF) and its receptors (VEGFRs). In bronchioloalveolar and papillary subtypes of ADC, the neoplastic cells, replacing the normal alveolar epithelial cells, had spread over alveolar walls and adhered firmly to alveolar interstitium as shown by the development of type IV collagen. Neoplastic cells of SCC were characterized by local proliferation in alveolar sacs without firm attachment to alveolar walls. Tumor lesions of SCC had often developed necrotic foci of various size. In ADC and SCC, alveolar capillary endothelial cells newly obtained reactivity to vWF. Such segments of endothelial cells lost surface thrombomodulin expression. CD31 was consistently expressed in normal and ADC tissues, but each endothelial cell marker was often attenuated or even lost in SCC, suggesting degeneration or necrosis of the alveolar capillaries. The capillary pericytes and interstitial fibroblasts were often hypertrophic and developed α-SMA in the cytoplasm in ADC, but they became atrophic in SCC. In ADC, apoptosis occurred in cells of alveolar capillaries more frequently in the peripheral zone than in the deeper zone of the tumor, whereas the frequency was not consistent in SCC. In microdissected alveolar wall tissues, mRNA expression patterns of VEGF isoforms and VEGFRs were similar in both ADC and SCC. In ADC, de novo angiogenic switching took place in cytoplasm as a unit of cells segments in alveolar capillary endothelium. Suppression of angiogenic switching in SCC implies that factors other than VEGF-VEGFR interaction, such as physical contact and compression of tumor cells, might play a critical role in alveolar capillaries.
- 日本医科大学医学会の論文
日本医科大学医学会 | 論文
- わが国における腸チフスの疫学的考察--1973年〜1976年届出菌検出例を中心として
- 臨床および実験報告 二絨毛膜双胎妊娠における高年初産の検討
- 救急災害医学の確立と展望[含 略歴 研究業績] (定年退職教授記念講演会講演要旨)
- 臨床のために 関節リウマチの診断と治療
- TNFファミリーの制御による関節リウマチ治療の可能性 (特集 第15回公開「シンポジウム」(アレルギー・膠原病に対する新たな展開))